Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-04-14
1989-03-07
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 22, 358177, 358167, H04N 5213, H04N 5275, H04N 974
Patent
active
048111040
ABSTRACT:
A noise eliminating apparatus, which may be used in a special effect system for a television video signal, removes noise from an input key signal by inhibiting signal transmission when the signal pulse width is below an arbitrary value. The noise eliminating apparatus includes an arbitrary value generator indicating a noise width to be eliminated. A pulse width detector produces a detection signal when the pulse width of the input key signal exceeds the noise width. A plurality of signal delay circuits are connected in series for sequentially delaying the input key signal. Associated with each delay circuit is a comparator for comparing a respective preselected constant value with the arbitary value and producing a respective coincident signal when such values coincide. A signal inhibitor, such as a logic AND gate, is associated with each delay circuit. The signal inhibitor inhibits the associated delay circuit from delaying the input key signal when the coincident signal is present but the detection signal is absent. With this arrangement, the input key signal following a removed noise signal is transmitted with unaffected width.
REFERENCES:
patent: 4628363 (1986-12-01), Kashiwa
Chin Tommy P.
NEC Corporation
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